Research on quantity traceability for high accuracy two-stage voltage transformer

Two-stage voltage transformer with low voltage excitation(LVE-TSVT) was designed for high accuracy. However, currently the voltage ratio standard and standard voltage transformer can not meet the need of its calibration accuracy. This paper is focus on quantity traceability for 10 kV LVE-TSVT with the method of measuring the error of reference voltage and voltage coefficient. Preliminary tests show that voltage error and phase displacement of 10 kV LVE-TSVT are both less than 1×10-6 at the 10% rated voltage, and its voltage coefficient is better than 5×10-6.